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Standard pipes of different schedule numbers and standard tubes of different $BWG$ numbers are available in the market. For a pipe/tube of a given nominal diameter, which one the following statements is $TRUE$ ?

  1. Wall thickness increases with increase in both the schedule number and the $BWG$ number
  2. Wall thickness increases with increase in the schedule number and decrease with increase in the $BWG$ number
  3. Wall thickness decreases with increase in both the schedule number and the $BWG$ number
  4. Neither the schedule number, nor the $BWG$ number has any relation to wall thickness
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